Replacement Discharge Valves for Sports Mask - Set of 4
This is a set of 4 replacement discharge valves designed for the Performance Sports Face Mask. 
The breathing valve can help improve air circulation inside and outside of the mask while aiding to balance the atmospheric pressure so you can avoid feeling stuffy inside your mask. 
Specifications: 


Easier Breathing: The exhaust valve is designed to release hot, humid exhaled breath quickly, helping to prevent an unpleasant buildup of heat inside the facepiece. 

Block External Pollution: The exhaust valve helps block external pollution and makes breathing easier.